R172 SLC250D - Oil Leak OM651

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Jun 12, 2018
Hannington, Northamptonshire
2003 SL55
Hi All, Been a few years since I posted on here but confusion is getting the better of me so I'm hoping some kind soul will point me in the right direction..... Or tell me where to go. :)

My wife sold her ultra reliable R171 SLK350 and bought a 2017 SLC250D. In the year of ownership it's had both NOX sensors and both front springs replaced due to failure. So, the £35 road tax may be great, but the spanner wielding hassle is not so. Anyway, it appears to have developed an oil leak, presumably on an engine oil cooler, but I can't see whether it's a joint that's got a failed rubber O ring seal, which I note is a common issue, or whether it's a genuinely broken pipe. I've spent a lot of time searching but not found anything directly relating to this. I'd be very grateful for any help. I've highlighted where the oil leak is in the picture.


  • Engine Oil Leak Highlighted.jpg
    Engine Oil Leak Highlighted.jpg
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